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8x57mm - so called "Mauser" rifle ammunition
Get a copy of Cartridges of the World by Frank Barnes; published by Gun Digest Press.
The 8x57mm cartridge is discussed in reasonable detail in various incarnations, from the initial loading for the 1888 Infantry Rifle and following. Those being the 1898 Mauser rifle and the shortened K98 rifle.
I'm not going to reprint it here and the book is seriously useful to anyone interested in various cartridges for whatever reasons.
Short version, the K98 rifle was issued and intended for use with the 1905 version of the cartridge, a 154 grain Spitzer FMJ at about 2880 fps in the rifle length barrel (about 30 inches) and around 2750 fps in the K98 version (about 23.6 inches).
To my knowledge, no commercial concern manufactures the updated, 1905 "JS" loading. Most everything has a 196 to 200 grain spitzer bullet loaded rather soft. Except for a few residual cartridges with usually Berdan and corrosive primers, the only way to get actual "JS" loaded ammunition is to load it. Loading manuals are full of information.
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